Tony Sparano, whose NFL coaching career included a 2014 stint as interim head coach of the Raiders, died unexpectedly Sunday.

Sparano was 56. The cause of death has not been disclosed.

According to Chris Mortenson of ESPN, Sparano and his wife, Jeanette, were about to leave for church when she found him unconscious in their kitchen. She tried CPR, but he could not be revived.

Mortenson reported that Sparano went to a hospital Thursday, complaining of chest pains. Tests were performed and he was released Friday, Mortenson said.

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